I agree with David here. Though I can see that you have a vision for the structuring of your company, you may want to take a step back and revisit the overall planning.

Nonetheless, you can structure a holdings company that can be a "parent" company for all your ventures. This way, it gets more organized. I did it for my company structure and it has been quite beneficial when it comes to organizing my portfolio.

Just remember that even though there is nobody holding you back in creating a holdings company structure, you have to understand that each company, subsidiary, etc., will have the same amount of legal and accounting costs needed to make these legal structures function.